Integrated Services Digital Network (ISDN); Outgoing Call Barring (OCB) Supplementary Services; Digital Subscriber Signalling System No. One (DSS1) Protocol; Part 1: Protocol Specification (V1.1.1; Withdrawn)
This first part of EN 301 001 specifies the stage three of the OCB supplementary services for the pan-European Integrated Services Digital Network (ISDN) as provided by the European public telecommunications operators at the T reference point or coincident S and T reference point (as defined in ITU-T Recommendation I.411 [9]) by means of the Digital Subscriber Signalling System No. one (DSS1) protocol. Stage three identifies the protocol procedures and switching functions needed to support a telecommunication service (see CCITT Recommendation I.130 [11]). In addition@ the present document specifies the protocol requirements at the T reference point where the service is provided to the user via an intermediate private ISDN. The present document does not specify the additional protocol requirements where the service is provided to the user via a telecommunications network that is not an ISDN. The outgoing call barring supplementary services comprise the following services: - Outgoing Call Barring-Fixed (OCB-F) supplementary service; - Outgoing Call Barring-User Controlled (OCB-UC) supplementary service. The OCB-F supplementary service enables a served user to have the network reject calls belonging to certain types@ when they are originated by the served user. The served user's ability to receive calls is unaffected by the OCB-F supplementary service. The OCB-F supplementary service may operate on all calls belonging to certain types@ or just on those calls associated with specified basic services. The OCB-F supplementary service operates according to the requirements specified by the served user on provision and cannot be activated or deactivated under the control of the served user. The OCB-UC supplementary service enables a served user to have the network reject calls belonging to certain types@ when they are originated by the served user. The served user's ability to receive calls is unaffected by the OCB-UC supplementary service. The OCB-UC supplementary service may operate on all calls belonging to certain types@ or just on those calls associated with specified basic services. The served user can select the barring program(s)@ activate and later deactivate them. The OCB supplementary services are applicable to all circuit-switched telecommunications services. Further parts of the present document specify the method of testing required to identify conformance to the present document. The present document is applicable to equipment supporting at least one of the OCB supplementary services@ to be attached at either side of a T reference point or coincident S and T reference point when used as an access to the public ISDN.